Customized Vacuum Furnace Design
When the state of the vacuum furnace changes, the actual temperature may deviate from the set value. At this time, the deviation can be corrected by the self-tuning function of the temperature controller to make the temperature rise strictly according to the set curve. Heating element is the load of heating power supply. Its material is high temperature molybdenum strip, which can work in high temperature for a long time. The resistance of the heating element should match the magnetic voltage regulator, otherwise the temperature will not rise or the magnetic temperature will rise higher. The main circuit of heating power supply is three-phase AC power supply, which is controlled by AC contactor and controlled by temperature controller.
Control circuit design Dual chamber vacuum furnace circuit design is input unit. In order to satisfy the control cabinet panel operation, automatic control signal detection and alarm, the input unit includes knob switches such as start-up of incoming and outgoing materials, movement of workpiece vehicle, heat-insulating switch, operation of vacuum unit, inflatable valve, start-stop of fan, exhaust valve, heating, vacuum valve and operation selection, as well as limit switch and alarm signal; the output unit includes heating AC contactor, vacuum unit. Workpiece truck, vacuum valve, heat insulation, filling and discharging valves, inflating valves, pressure divider valves, discharging valves, indicator lights and other executive components and sound and light alarm. Manual operation is mainly used to debug and maintain the vacuum furnace. Its control is to execute component action after input operation. Individual components are interlocked to prevent misoperation. Automatic operation is applied to the normal operation of the vacuum furnace. It is controlled automatically by the detected automatic control signal and judged by the application program.
Customized Vacuum Furnace Maintenance and Maintenance
Check whether the door seal ring is damaged. If there is dirt on the seal ring, the giant transformer should be cleaned in time. It is better to apply vacuum grease after dipping cotton cloth in alcohol. Check whether the heating elements in the furnace bed and molybdenum screen are in good condition, and the damaged parts should be repaired and replaced in time. When there is contamination in the furnace, the dust of Ningbo dust collector is absorbed by a vacuum cleaner, and the reflecting screen and heating elements of the heating chamber are wiped with silk cloth dipped in alcohol. If there is oil stain on the inner wall of the furnace, the oil stain is removed by dipping cotton cloth in gasoline first, and then wiped with cotton cloth dipped in alcohol.
At the end of each operation, the furnace should be stored in a certain vacuum. Check the oil level of mechanical pumps and add new oil to the oil mark when the oil level is below the mark line. When it is found that the oil of mechanical pumps has emulsified oil-water mixture, viscous and white $phenomenon, the old oil should be replaced in time. The method is to unscrew the pressure cap of the discharge hole of Mechanical pumps, release the old oil, add a little new oil from the filling hole, flush the pump chamber, and tighten the pressure cap of the discharge hole of mechanical pumps from the filling hole. It is not advisable to add too much new oil to the standard place. Tighten the pressure cap of the filling hole of the mechanical pump. In this process, it is necessary to prevent damage to the sealing ring of the filling and discharging hole, and replace it immediately if there is damage. At the end of each shift, wipe the outside of the furnace with cotton cloth to remove dust and oil from the mechanical pump and diffusion pump.